class instance from string

[Kristoph]

Greetings,

I have a String instance which contains the name of a class. Is there
some way I can instantiate that class from given the class name in the
string?

Many Thanks, in advance, for any assistance,

Kristoph

 

[Geoff Stearns]

I have a String instance which contains the name of a class. Is there

some way I can instantiate that class from given the class name in the
string?

If you are trying to do what I think you are, there's a few ways you
can do it.

Here's two examples:

// set up the class
function MyClass() {
this.foo = "bar";
}

// store the class name in a string
var classIdString = "MyClass";

// first method
var classInstance = new this[classIdString];

// second method
var classInstance2 = eval("new "+ classIdString);

// test them
alert(classInstance.foo);
alert(classInstance2.foo);

 

[Kristoph]

I have a String instance which contains the name of a class. Is there
some way I can instantiate that class from given the class name in the
string?

If you are trying to do what I think you are, there's a few ways you
can do it.

Here's two examples:

// set up the class
function MyClass() {
this.foo = "bar";

}

// store the class name in a string
var classIdString = "MyClass";

// first method
var classInstance = new this[classIdString];

// second method
var classInstance2 = eval("new "+ classIdString);

// test them
alert(classInstance.foo);
alert(classInstance2.foo);

var classInstance = this[classIdString];

.... that's exactly what I was looking for

Thank you very much.

]{

 

[Evertjan.]

Kristoph wrote on 18 mrt 2007 in comp.lang.javascript:

var classInstance = new this[classIdString];

var classInstance = this[classIdString];

... that's exactly what I was looking for

May be, but that was not what was suggested